If you're going to include interests put something you do that is out of the ordinary. If you put polar bear wrestling the interviewer might be interested but if you put reading or sports you may as well not bother. Something specific like needle point embroidery can be used to demonstrate attention to detail and that you have stickability so don't be scared to write a sentence or two to tell employers why your interest makes you a better person for the job.

Do you have a hobby? What do you do in your spare time?